Ascend4nt Posted March 10, 2009 Share Posted March 10, 2009 (edited) For AutoIT developers, I have a quick question: It was pointed out to me that DLLCall's will automatically set up a return buffer for datatypes marked as "wstr". The way I've been coding it is to use DLLStructCreate("wstr[#]") and send it as a pointer to ensure that I have a buffer large enough to receive the data. However, I have been told that instead, I can pretty much take it as a given that if I simply put "wstr" AutoIT will set up a default buffer (it was mentioned that this buffer will be 65536 chars/wchars). I know the help file describes a 'maximum' of the same, but I thought this was intended for passing data *to* a DLL call though? So, I'd just like to know if I can rely on this automatic return-buffer setup or not. For an example (cut from '_WinAPI_ProcesGetFileName'): $stImageFilename=DllStructCreate("wchar[32767]") $aRet=DllCall("Psapi.dll","dword","GetProcessImageFileNameW","ptr",$hProcess[0],"ptr", _ DllStructGetPtr($stImageFilename),"ulong",32767) Would this be able to be replaced with: $aRet=DllCall("Psapi.dll","dword","GetProcessImageFileNameW","ptr",$hProcess[0],"wstr","","ulong",32767) Clarification is much appreciated, thanks, Ascend4nt *edit - added example Edited March 11, 2009 by ascendant My contributions: Performance Counters in Windows - Measure CPU, Disk, Network etc Performance | Network Interface Info, Statistics, and Traffic | CPU Multi-Processor Usage w/o Performance Counters | Disk and Device Read/Write Statistics | Atom Table Functions | Process, Thread, & DLL Functions UDFs | Process CPU Usage Trackers | PE File Overlay Extraction | A3X Script Extract | File + Process Imports/Exports Information | Windows Desktop Dimmer Shade | Spotlight + Focus GUI - Highlight and Dim for Eyestrain Relief | CrossHairs (FullScreen) | Rubber-Band Boxes using GUI's (_GUIBox) | GUI Fun! | IE Embedded Control Versioning (use IE9+ and HTML5 in a GUI) | Magnifier (Vista+) Functions UDF | _DLLStructDisplay (Debug!) | _EnumChildWindows (controls etc) | _FileFindEx | _ClipGetHTML | _ClipPutHTML + ClipPutHyperlink | _FileGetShortcutEx | _FilePropertiesDialog | I/O Port Functions | File(s) Drag & Drop | _RunWithReducedPrivileges | _ShellExecuteWithReducedPrivileges | _WinAPI_GetSystemInfo | dotNETGetVersions | Drive(s) Power Status | _WinGetDesktopHandle | _StringParseParameters | Screensaver, Sleep, Desktop Lock Disable | Full-Screen Crash Recovery Wrappers/Modifications of others' contributions: _DOSWildcardsToPCRegEx (original code: RobSaunder's) | WinGetAltTabWinList (original: Authenticity) UDF's added support/programming to: _ExplorerWinGetSelectedItems | MIDIEx UDF (original code: eynstyne) (All personal code/wrappers centrally located at Ascend4nt's AutoIT Code) Link to comment Share on other sites More sharing options...
Ascend4nt Posted March 11, 2009 Author Share Posted March 11, 2009 well, I hardly ever do this, but *BUMP* Not sure if I should have posted this elsewhere My contributions: Performance Counters in Windows - Measure CPU, Disk, Network etc Performance | Network Interface Info, Statistics, and Traffic | CPU Multi-Processor Usage w/o Performance Counters | Disk and Device Read/Write Statistics | Atom Table Functions | Process, Thread, & DLL Functions UDFs | Process CPU Usage Trackers | PE File Overlay Extraction | A3X Script Extract | File + Process Imports/Exports Information | Windows Desktop Dimmer Shade | Spotlight + Focus GUI - Highlight and Dim for Eyestrain Relief | CrossHairs (FullScreen) | Rubber-Band Boxes using GUI's (_GUIBox) | GUI Fun! | IE Embedded Control Versioning (use IE9+ and HTML5 in a GUI) | Magnifier (Vista+) Functions UDF | _DLLStructDisplay (Debug!) | _EnumChildWindows (controls etc) | _FileFindEx | _ClipGetHTML | _ClipPutHTML + ClipPutHyperlink | _FileGetShortcutEx | _FilePropertiesDialog | I/O Port Functions | File(s) Drag & Drop | _RunWithReducedPrivileges | _ShellExecuteWithReducedPrivileges | _WinAPI_GetSystemInfo | dotNETGetVersions | Drive(s) Power Status | _WinGetDesktopHandle | _StringParseParameters | Screensaver, Sleep, Desktop Lock Disable | Full-Screen Crash Recovery Wrappers/Modifications of others' contributions: _DOSWildcardsToPCRegEx (original code: RobSaunder's) | WinGetAltTabWinList (original: Authenticity) UDF's added support/programming to: _ExplorerWinGetSelectedItems | MIDIEx UDF (original code: eynstyne) (All personal code/wrappers centrally located at Ascend4nt's AutoIT Code) Link to comment Share on other sites More sharing options...
weaponx Posted March 11, 2009 Share Posted March 11, 2009 Maybe your post is too generalized and not citing a specific example. Link to comment Share on other sites More sharing options...
Ascend4nt Posted March 11, 2009 Author Share Posted March 11, 2009 Well, I mean really *any* DLL call that expects a Return buffer set up to collect data. For example (cut from '_WinAPI_ProcesGetFileName'): $stImageFilename=DllStructCreate("wchar[32767]") $aRet=DllCall("Psapi.dll","dword","GetProcessImageFileNameW","ptr",$hProcess[0],"ptr", _ DllStructGetPtr($stImageFilename),"ulong",32767) My contributions: Performance Counters in Windows - Measure CPU, Disk, Network etc Performance | Network Interface Info, Statistics, and Traffic | CPU Multi-Processor Usage w/o Performance Counters | Disk and Device Read/Write Statistics | Atom Table Functions | Process, Thread, & DLL Functions UDFs | Process CPU Usage Trackers | PE File Overlay Extraction | A3X Script Extract | File + Process Imports/Exports Information | Windows Desktop Dimmer Shade | Spotlight + Focus GUI - Highlight and Dim for Eyestrain Relief | CrossHairs (FullScreen) | Rubber-Band Boxes using GUI's (_GUIBox) | GUI Fun! | IE Embedded Control Versioning (use IE9+ and HTML5 in a GUI) | Magnifier (Vista+) Functions UDF | _DLLStructDisplay (Debug!) | _EnumChildWindows (controls etc) | _FileFindEx | _ClipGetHTML | _ClipPutHTML + ClipPutHyperlink | _FileGetShortcutEx | _FilePropertiesDialog | I/O Port Functions | File(s) Drag & Drop | _RunWithReducedPrivileges | _ShellExecuteWithReducedPrivileges | _WinAPI_GetSystemInfo | dotNETGetVersions | Drive(s) Power Status | _WinGetDesktopHandle | _StringParseParameters | Screensaver, Sleep, Desktop Lock Disable | Full-Screen Crash Recovery Wrappers/Modifications of others' contributions: _DOSWildcardsToPCRegEx (original code: RobSaunder's) | WinGetAltTabWinList (original: Authenticity) UDF's added support/programming to: _ExplorerWinGetSelectedItems | MIDIEx UDF (original code: eynstyne) (All personal code/wrappers centrally located at Ascend4nt's AutoIT Code) Link to comment Share on other sites More sharing options...
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